Improvement in looms



N, PETERS. PHOTO-LITHDGHLFHEH, WASHINGTUN D C ift UNITED STATES PATENT OEEICE.

IMPROVEMENT IN vLooms.

Specification forming part of Letters Patent No. 36,029, dated July 29, 1862.

Too/,ZZ whom it may concern:

Be it known that I, SrLAs Summen, of

Taunton, in the county of Bristol and State of Massachusetts, have invented a new and useful Improvement in the LetO' Motion' of Looms; and I do hereby declare that the following is a full, clear, and exact description of the same, referencebeing had to the accompanying drawings, forming part of this speciication, in which- Figure lis a side view of a let-off motion with my improvement. Fig. 2 is a front view. ofthe same. Fig. 3 is a side view of the double detent-lever of the escapement-motion, whose application to the let-off motion constitutes an important feature of my invention.

Similar letters of reference indicate corresponding parts in the several figures.

A isthe framing of the loom.

B is the yarn-beam, arranged vin the usual manner, and having fast upon it the spur-gear I, gearing with a smaller spur-gear, J, on a short horizontal shaft, K, which works in a fixed bearing secured to the side framing of the loom, the said shaft carrying outside of the framing a wheel, L, having V-shaped teeth,

vwhich I call the escapement-wheel, and

which constitutes part of what I call the escapement-motion. 7

M is the double detent-lever, which constitutes the other part of the escapement-motion, arranged to work on a fixed fulcrum, et, secured to the framing of the loom, and having formed upon it at equal distances from its fulcrun1,on opposite sides thereof, two pallets or detents, but, more properly speaking, detents constructed and arranged to operate in the teeth of the wheel L in a manner something like the pallets of the verge of a clock-that is to say, to prevent the said wheel from moving more than one Vtooth at a time. This lever, whose form is best shown in Fig. 3, has attached to it a weight, N, or is otherwise loaded to make the detent c drop in between the teeth of the wheel L.

C is a vibrating whip-roll supported by two arms, D', of a rock-shaft, D, which is arranged in fixed bearings above the yarn-beam. This rock-shaft has fast to it near one end a threearmed lever, E F G. The arm E of this lever has suspended from it a weight, H, sufcient to counterbalance the weight of the whip-roll and the downward pressure produced on the Asaid roll by the tension of the Warp between the yarn-beam and the take-up. The arm F has suspended from it a rod, P, which is situated over the detent b, or over that arm of the' said lever to which the said detent is attached, said rod working through a guide, d, secured to the framing A., and the arm G is fitted with a screw, e, to come in contact with a fixed stop, Q, on the framing, for the purpose of limiting the height to which the weight H is allowed to raise the whip-roll. By adjusting this screw the above height may be regulated.

The yarn passes from the `yarn-beam over the rock-shaft D and over the whip-roll, as shown in red color in Fig. 1, and its tension tends to draw oft' yarn from the yarn-beam and turn the beam and the escapementwheel in the direction of the arrow shown upon them; but this tendency is prevented bythe stoppage of the escapementwheel by the detent c until the lay beats up, when the additional strain brought upon the warp, pressing upon the whip-roll.' overcomes the effect of the weight H and depresses the said roll more or less, and by that means causes a greater or less depression of the arm F and of its attached rod l?. In case the tension of the warp has been so great as to require more yarn to be let off, the depression of the roll and arm F is sufficient to bring the rod l? down upon the detent-lever M and cause it t0 depress the detent b sufciently to raise the other one, c, out of the escapementwheel L,'and so permit the said wheel and the yarn-beam to turn till the said wheel is stopped by the detent c. When the lay goes back, the warp, being relieved of the strain produced in beating up, permits the Whip-roll to be raised by the weight H, which also raises the arm F and rod P, and so permits the weight N, attached to the escapement-lever, to raise the detent I) and depress c, which permits the wheel L and yarn-beam to turn again till the Wheel is again arrested by the detent c. The distance moved by the wheel in the two movements above specified is only equal to one tooth.

In order to obtain a proper movement of the yarn-beam, it is desirable that the gear J should be about one-twelfth the size of that I, and the number of teeth in the escapement-wheel L should be such that when weavin g the last end of a web it shall be let off at the rate of about nine notches of the escapement-wheel to ten strokes of the lay.

anism L M and. the yarn-beam B, 0f the shaft K, gear J, three-armed Weighted adjustable lever E F G, rock-shaft D, the adjuster e, rod P, and Whip-roll C, in the manner and for the purpose herein shown and described.

SILAS SHEPARD.

Witnesses:

BENJA. N. SHEPARD. GEORGE M. POUND.

if l. 

